669360761 has 2 divisors, whose sum is σ = 669360762. Its totient is φ = 669360760.

The previous prime is 669360751. The next prime is 669360763. The reversal of 669360761 is 167063966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 584720761 + 84640000 = 24181^2 + 9200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669360761 is a prime.

Together with 669360763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669360763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334680380 + 334680381.

It is an arithmetic number, because the mean of its divisors is an integer number (334680381).

Almost surely, 2^669360761 is an apocalyptic number.

It is an amenable number.

669360761 is a deficient number, since it is larger than the sum of its proper divisors (1).

669360761 is an equidigital number, since it uses as much as digits as its factorization.

669360761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 669360761 is about 25872.0072858679. The cubic root of 669360761 is about 874.7556372321.

The spelling of 669360761 in words is "six hundred sixty-nine million, three hundred sixty thousand, seven hundred sixty-one".